Hello everyone,
Quick question about contract_vertices():
http://igraph.org/c/doc/igraph-Structural.html#igraph_contract_vertices
I don't have attributes. Can I just pass vertex_comb=NULL?
Szabolcs
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Actually I don't fully understand this function.
The signature is:
int igraph_contract_vertices(igraph_t *graph,
const igraph_vector_t *mapping,
const igraph_attribute_combination_t *vertex_comb);
'graph' is the input graph. Where is the new graph returned?
On 19 September 2016 at 15:1
> I don't have attributes. Can I just pass vertex_comb=NULL?
Yes, you should be able to do that safely. If it isn't safe then it's a bug.
T.
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> int igraph_contract_vertices(igraph_t *graph,
> const igraph_vector_t *mapping,
> const igraph_attribute_combination_t *vertex_comb);
>
> 'graph' is the input graph. Where is the new graph returned?
Nowhere - "graph" will be modified in-place.
T.
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I should have looked at the code more carefully.
I appears that:
1. The original graph is destroyed and replaced with the new one.
2. vertex_comb is checked for being NULL. In that case the attribute
handling code is skipped.
On 19 September 2016 at 15:23, Szabolcs Horvát wrote:
> Actually I
